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    <title>async-defer</title>
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    <div>打开浏览器查看控制台，看看3种脚步的加载顺序以及结果</div>
    <script src="./async-defer-js-1.js"></script>
    <script src="./async-defer-js-2.js" async></script>
    <script src="./async-defer-js-3.js" defer></script>
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